September 9, 201510 yr You've gone over the medal limit. The right-most option is to sell, I believe. The middle option is to use medals to upgrade others, and I would assume the left-most option is to throw them away.
September 9, 201510 yr I just got this too. I quickly ran it through Google and Vision is pretty much right.
September 9, 201510 yr if this window appears, you can pay for a bigger medalcapacity (left button, 100 medals for 5 more medals you can have). The button in the middle is for upgrading your medals so you have more place again. The right one is to sell medals.
What does this picture mean i find it a lot lately